The Tenori-On is the zany Yamaha touch-based musical sequencer that caught our eye earlier this year, but this cool PacklSound1 iPhone app could very well be the portable version that puts us over the edge. It's a simpler version of the original $1,200 Tenori-On box, but that didn't stop the designer from laying down a quick, catchy beat. Seeing it in action, makes me want it right now: